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See list of 7 species in this genus

Linaria aeruginea (Gouan) Cav. was reported from CT by Kartesz (1999), based on Harger et al. (1922). Harger et al. did not report L. aeruginea but rather reported L. reticulata Willd., a taxon that may belong in the synonymy of the European L. aeruginea (according to Chater et al. 1972). However, the original collection was determined as L. reticulata Desf. by Fernald (note discrepant authorities), a different species from northern Africa now referred to as Linaria pinifolia (Poir.) Thellung. Therefore, the report of L. aeruginea is here considered erroneous (i.e., it should be excluded from the regional flora). Linaria angustissima (Loisel.) Borbás was reported from Worcester County, MA, by several sources (e.g., Seymour 1982), based on Gates 28177 ( NEBC!). This specimen is L. vulgaris, as evidenced by the pubescent raceme and spur longer than 10 mm. I have seen two specimens determined as Linaria bipartita (Vent.) Willd., one from Fairfield County, CT ( Eames 9511 p.p. GH!), which was actually L. maroccana and one from Middlesex County, MA (17 Jul 1924, Kidder s.n. AMES!), which was taken from a cultivated plant. Therefore, this species, which is now treated as L. incarnata (Vent.) Spreng., is also excluded from New England. Linaria dalmatica (L.) P. Mill. ssp. macedonica (Griseb.) D.A. Sutton was reported from MA and NH by Kartesz (1999), but specimens are unknown. Linaria supina (L.) Chaz. was reported from MA by Knowton and Deane (1923c). However, the specimen (10 Jul 1863, Boott s.n. GH!) was collected from a cultivated plant (i.e., this species is not naturalized in New England; Sorrie and Somers 1999). Reference: Chater et al. (1972).

  • 1a. Corolla white to purple or red-purple and usually faintly to prominently striped with purple, with a white, yellow, or orange palate; seeds ovoid-trigonous, transversely rugose, unwinged or with very narrow, flange-like wings
    • 2a. Spur 2–5 mm long; corolla white to pale purple, therefore, the purple stripes very prominent; stigma capitate; pedicels and sepals glabrous; plants perennial by creeping rhizomes
    • 2b. Spur 5–15 mm long; corolla purple or red-purple, therefore, the purple stripes less conspicuous; stigma bifid; pedicels and often the sepals pubescent with septate hairs; plants annual
  • 1b. Corolla yellow, with a yellow or an orange palate; seeds discoid, not rugose, with a marginal wing or compressed-pyrimidal, rugulose, and with flange-like wing angles (ovoid-trigonous, transversely rugose, and unwinged in L. spartea)

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